Deck list work

SVSim.EmulatedEntrypoint/Models/Dtos/GuildNotification.cs

@@ -5,20 +5,25 @@ namespace SVSim.EmulatedEntrypoint.Models.Dtos;
 
 /// <summary>
 /// guild_notification on /mypage/index. Consumed by
-/// MyPageNotifications.GuildNotification.SetGuildNotification. Prod sends nulls
-/// for guild_id / guild_room_message_id when the viewer isn't in a guild; with
-/// WhenWritingNull those keys are omitted on our wire, which is equivalent
-/// since the parser is null-tolerant.
+/// MyPageNotifications.GuildNotification.SetGuildNotification (GuildNotification.cs:30-38),
+/// which reads guild_id / guild_room_message_id via `var x = json["guild_id"]; if (x != null) ...`
+/// — the LitJson indexer throws KeyNotFoundException on a missing key, so these
+/// must reach the client as explicit nulls when there's no guild. Override the
+/// global WhenWritingNull so they survive serialization. Prod's wire matches:
+/// `"guild_notification":{"guild_id":null,"guild_room_message_id":null,...}`.
+/// See [[project-wire-null-policy]] for the broader pattern.
 /// </summary>
 [MessagePackObject]
 public class GuildNotification
 {
     [JsonPropertyName("guild_id")]
     [Key("guild_id")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.Never)]
     public long? GuildId { get; set; }
 
     [JsonPropertyName("guild_room_message_id")]
     [Key("guild_room_message_id")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.Never)]
     public long? GuildRoomMessageId { get; set; }
 
     [JsonPropertyName("is_join_request")]